<i>Retro</i>-Aza-Piancatelli Rearrangement Triggered Cascade Reaction of Methyl Furylacrylates with Anilines to Access Cyclopenta[<i>b</i>]pyrrolidinones
作者:Lei Xu、Hongxiang Li、Liuzhuang Xing、Qian Yang、Yurong Tang、Yunfei Cai
DOI:10.1021/acs.joc.1c02546
日期:2022.1.7
a new type of functionalized furanoxonium ion precursor, permitting rapid and flexible construction of diverse cyclopenta[b]pyrrolidinone derivatives. The unprecedented and highlyefficient bicyclic γ-lactam product formation is originated from an unusual retro-aza-Piancatelli rearrangement of the major cis-fused multifunctionalized cyclopentenone to the minor trans-fused one followed by a lactamization
利用呋喃基丙烯酸甲酯作为一种新型的功能化呋喃氧离子前体,开发了一种新型的 aza-Piancatelli 重排引发的级联反应,可以快速灵活地构建多种环戊二烯[ b ]吡咯烷酮衍生物。前所未有且高效的双环 γ-内酰胺产物的形成源于主要的顺式稠合多官能化环戊烯酮发生不寻常的逆-aza-Piancatelli 重排到次要的反式稠合的环戊烯酮,然后发生内酰胺化反应。
1,5‐Allyl Shift by a Sequential Achmatowicz/Oxonia‐Cope/Retro‐Achmatowicz Rearrangement
furfuryl alcohol through two-step sequential ring expansion/contraction rearrangement at room temperature, which could be considered as a Woodward–Hoffmann-forbidden formal [3,5]-sigmatropic rearrangement. Mechanistically, it involves Achmatowiczrearrangement, oxonia-Cope rearrangement, and an unprecedented “retro-Achmatowicz” rearrangement.